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本文简单介绍复旦大学“789”光学文字识别系统使用的飞点扫描器。该扫描器采用高分辨率飞点管作阶梯波点阵扫描,具有速度快、控制灵活的优点;系统中设有飞点管孔栏校正、象散校正、同轴校正、动态聚焦、亮度自动调节等装置,能在较大的扫描区域内达到高分辨率、高精度以及良好的信噪比与稳定性;视象信号量化系统采用阈值自动控制电路,能适应各种印刷质量较差、字符深浅不同的扫描文件;信号接收系统设有红黑两个通道,采用“S 曲线变换法”与“时间逻辑电路”相结合的颜色分选电路,能区分红黑两种不同颜色的字符;采用抽气吸纸及步进输纸机构,能有效地传送折迭式文件。综上所述,该扫描器是一种控制灵活、适应性广,分辨率、精度和速度都很高的光电转换装置。
This article briefly introduces Fudan University’s “789” optical text recognition system using the fly point scanner. The scanner uses a high-resolution fly-point tube for staircase wave lattice scanning, with the advantages of fast speed and flexible control. The system has a fly-hole pipe column correction, astigmatism correction, coaxial correction, dynamic focusing, automatic brightness Adjustment and other devices, in a larger scanning area to achieve high resolution, high precision and good signal to noise ratio and stability; video signal quantization system uses automatic threshold control circuit to adapt to a variety of poor print quality, character Different shades of scanning documents; signal receiving system with red and black channels, the use of “S-curve transform” and “time logic” combination of color sorting circuit, can distinguish between red and black two different color characters; using Suction suction and step feeding mechanism, can effectively send the folding file. In summary, the scanner is a flexible control, wide adaptability, resolution, precision and speed are high photoelectric conversion device.